Ya know, those creepy plant looking guys that wouldn't show up on your compass and would just popout of the growth when you walked near. Yeah, those things scared the crap out of me. EVERY SINGLE TIME one would pop out I would jump ten feet. I hated Vault 22 SO much.
Fallout New Vegas had a suprising ammount of scares in it. Wandering around dark abandoned warehouses always made my skin tingle. For some reason, alot more than F3 did. I'm not the only one that New Vegas scared the Bejeebus out of am i?
I wouldn't say they scared the bajeebus out of me, but the first two times or so they positively made me jump a bit. And then I was walking mighty slow through the rest of vault 22 with my rifle aimed at any plant matter...
Come to think of it, I can't recall Fallout 3 giving me any sort of scare at all. There's something to be said when you're trying to explore a mountain, however, and the suddenly -- Cazadors! Cazadors everywhere. And you play with hardcore enabled. :(